This grade consists of 2 sheets of 30# Kraft Paper laminated with a layer of Asphalt, providing a flexible waterproof material. End uses include the heavy duty applications with a great deal of water such as concrete curing paper and overseas crate waterproofing. GP33A is also used during hard surface restoration such as granite and marble refinishing to protect stone from overexposure to harsh cleaning chemicals. Often referred to as 30/30/30 .
| Standard Width x Length | Weight |
| 36” x 600’ (1800 sq ft) | 54# |
| 48” x 600’ (2400 sq ft) | 72# |
| 60” x 600’ (3000 sq. ft) | 90# |
| 72” x 600’ (3600 sq. ft) | 108# |
| 84” x 600’ (4200 sq. ft) | 126# |
| 96” x 600’ (4800 sq. ft) | 144# |